Feeding mechanism for sewing-machines.



G. E. MOLYNEUX.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED DEC. 2, 1912.

1 1 92,8 1 9. Patented July 25, 1916.

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nNrrE sin a i w "p- GEORGE E. MOLYNEUX, OE BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION on NEW JERSEY.

. FEEDING MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Application filed December 2, 1912. Serial No. 734,446.

To all whom'it may concern:

Be it known that I, GEORGE E. MoLYNEUx, a citizen of the United States, residing at Bayonne, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Feeding Mechanisms for Sewing-Machinesof which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an improvement in feeding mechanism, and especially to that class of feeding mechanism employed to feed the work longitudinally of the work-supporting arm of sewing machines designed for stitching tubular articles such as the sleeves or legs of garments; and it has for its object the provision of such mechanism with means within the reach of the operator for adjusting the length of the feeding movement for production of stitches of the desired lengths for diflerent kinds of work.

While applicable to other styles of sewing machines, the present improvement is designed more particularly for embodiment in sewing machines of the Singer type, such as that of my Patent No. 1,0973%, of May 19, 1914, in which the feed-bar is arranged within and longitudinally of the work-supporting arm or cylinder and is connected to the rotary main-shaft extending across the hollow standard of the machine frame within said standard for producing the endwise operative or feeding movements of the feedbar which may derive'its rising and falling movements from any usual or suitablemeans. In its preferred construction, the feeding mechanism comprises an actuating eccentric upon the main-shaft embraced'by a strap at one end of an eccentric-rod whose opposite end is connected with a rock-bar which is in turn pivotally connectedwith one arm of a rocker fulcrumed within the stand ard and having a second arm connected with the rearward end of the feed-bar, the said rock-bar having a fulcrum adjustable endwise thereof by a. connection extending through the wall of the standard within the convenient reach of the operatorand provided with suitable means for securing it in the desired position of adjustment, and preferably with a scale and pointer to indicate the stitch lengths corresponding with its several positions of adjustment.

' In the accompanying drawings, Figure 1 is a rear side elevation of a cylinder-bed machine of the Singer type embodying the present lmprovement, and represented with certain parts of the frame in section. Fig. 2 18 a perspective view representing the operative connection between the feed-bar and the main-Shaft, and showing the feed-regulating or adjusting device. Fig. 3 is a perspective view of the rOck leVer, and Figs. 4: and 5 are similar views respectively of the rock-lever fulcrum-carrier and fulcrum. Fig. 6 is a perspective view of the pointer or index-plate and Fig. 7 a similar view of the steady-pin for the ball-and-socket joint between two 'of .the pivotally connected elements of-the mechanism.

The frame of the machine is shown formed with the hollow standard 1 to one side of which is secured the tubular worksupport or cylinder-bed 2, and from the up per portion of which extends the overhanging arm 8 in the outer end of which are journaled the needle-bar 4 carrying the needle 5 and the presser-bar 6 to the reduced lower end of which is secured the shank 7 of the resser-foot 8. Journaledwithin the'bearing boss 9 at the rearward side of thestandard and extending across the latter and longitudinally through the arm 2 is the r0- tary main-shaft 10' provided upon its rearward end with the grooved pulley wheel 11 and having mounted thereon within the standard 1-the feed-actuating eccentric 12.

The-main-shaft 10 is provided nearits forward end within the arm 2 with the feedlifting eccentric 13 embraced by the strap 14 at the low'eren'd of the post 15 sustaining the rocking bearing sleeve 16 in which is slidingly journaled the reduced cylindrical portion 17 of the feed-bar 18 having secured upon the forward extremity of the extension 18 thereof the feed-dog 19 with the usual serrated upper feeding surface adapted to pass through the feed aperture 20 of the throat-plate 21' and acting in conjunction with the lower face of thepresser-foot 8- in the usual manner. At its rearward end, the feed-bar isreduced and threaded to receive the strap 22 which is secured in position thereon by means of the lock-nut 23.

The strap. 22 is provided with" a ballsocket fitted to the spherical extremity 24: of a lateral arm 25 having a split hub 26 adjustably secured by means of the clampscrew 27 upon the upper end of the rocking sleeve 28 whose lower end is provided with an angularly arranged lateral arm 29 terminating at its outer end in the ball 30.

The plural-armed rocker, afforded by the sleeve 28 with its lateral arms 25 and 29, is mounted upon the shouldered fulcrum-stud 31 whose reduced and threaded lower por tion passes through a supporting lug 32 upon the inner wall of the standard 1 in which the stud is secured by means of the clamp-nut 33.

At the lower end of the substantially ver tical rock-bar 34 is a lateral extension 35 recessed in its lower side to afford the upper half of a spherical socket fitted upon the ball 30 and having secured thereto the cap 36 similarly recessed to embrace said ball. The upper end of the rock-bar 34 carries the stud 37 formed with the spherical head 38 which is secured in place by means of the jam-nut 39 applied to the threaded shank of said stud. To the ball 38 is fitted a spherical socket formed in the cap 40 and the enlarged upper portion 41 of a connecting rod 1-2 which is formed at its opposite end with the strap 4L3 embracing the actuating eccentric 12 upon the main-shaft. In practice the ball 38 has an axial aperture entered by the steady-pin 44 projecting from a plate 15 secured by a fastening screw -16 upon the connecting rod 42.

The enlarged lower portion of the rockbar 34 is shown provided with a longitudinal T-shaped slot 17 within which is fitted the slide-plate 48 carrying the stud-pin 49 which is journaled within a transverse aperture 50 of the fulcrum-block 50 arranged within the standard 1 with the flange 51 resting against the inner wall of the standard. .A washer 52 is shown interposed between the slide-plate 48 and the fulcrum-block 50. The fulcrum-block has upon the opposite face of said flange the outwardly extending elongated lug 53 with the threaded pin 54: projecting from the extremity of the same, as represented in Fig. 4.

The lug 53 passes through a slot 55 provided therefor in the wall of the standard and the fulcrum-pin is clamped in position by means of a thumb-nut 56 applied to the pin 54 with its inner end resting upon the index-plate or washer 57 interposed between the same and the graduated scale-plate 58 surrounding the aperture 55 and secured to the standard by means of the fastening 1 screws 59. The washer 57 has the inturned lip 57 entering the slot 55 by means of which the washer is prevented from turning with the thumb-nut 56.

As will be observed, in the operation of the machine the actuating eccentric 12 im parts endwise movements to the connecting rod 42 which are transmitted through the rock-bar 34 to the rocker 25 28 29 which communicates to the feed-bar 18 endwise operative or feeding movements proportionate to the uniform endwise movements of the connecting rod and determined in extent by the position of the fulcrum-pin e9 rela tively to the pivotal connections of the rockbar to the connecting rod and the rockerarm. As will be observed, the feed-bar 18 is disposed and moves in a direction lengthwise of the main-shaft 10, as shown more fully in my said patent. By loosening the thumb-nut 5G and using the same as a knob, the fulcrum-block 50 may be raised or lowered to correspondingly shift the fulcrum pin 19 for production of the desired length of feed as indicated by the edge of the index-plate 57 in conjunction with the graduations of the scale-plate 58.

It will be seen that by the present improvement the throw of the feeding mechanism may be easily regulated by the operator without the use of a screw-driver or other tool and without removal of any coverplate or other part of the machine.

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, the combination with a shaft, and a feed-actuating member thereon, of a feedbar substantially parallel with said shaft, a pivotal support for said feed-bar, a plural-armed rocker having an arm connected to and affording another support for said feed-bar, a connecting rod embracing and deriving endwise movements from said actuating member, a rock-bar connected at opposite ends to said connecting rod and to another arm of said rocker and movable transversely of the feed-bar, and a fulcrum for said rock-bar disposed intermediate the ends of the same and adjustable endwise thereof.

2. In a sewing machine, the combination with the frame comprising a hollow standard, a tubular work-supporting arm ex tending laterally therefrom and an overhanging arm extending from said standard above the work-supporting arm, a rotary shaft extending across said standard and lengthwise of the work-supporting arm, and stitch-forming mechanism comprising an element sustained by said overhanging arm, of a feed-bar arranged Within and longitudinally of said work-supporting arm, means disposed within said standard for operatively connecting the feed-bar with said shaft for imparting positive endwise feed and return movements to the feed-bar,

means also disposed within the standard and connected with the first-named means for varying the extent of said feeding movements, and means for imparting to the feedbar rising and falling movements.

3. In a sewing machine, the combination with the frame comprising a hollow standard and a tubular work-supporting arm attached thereto, and a rotary shaft extending across said standard, of a feed-bar arranged within and longitudinally of said arm, means disposed within said standard for operatively connecting the feed-bar with said shaft for imparting endwise feeding movements to the feed-bar, normally stationary means also disposed within the standard and connected with the first-named means for varying the extent of said feeding move ments, and means operating independently of the endwise movements of the feed-bar for imparting to the feed-bar rising and falling movements.

,4:- In a sewing machine, the combination with the frame comprising a hollow standard and a tubular work-supporting arm extending laterally therefrom, a rotary shaft extending across said standard, and an actuating member mounted upon said shaft within the standard, of a feed-bar arranged within and longitudinally of said arm, a plural-armed rocker having an arm connected with said feed bar, a rod operatively connected with said actuating member, a rock-bar pivotally connected with said rod and with said rocker, and a fulcrum for said rock-bar disposed within said standard and adjustable longitudinally of the same.

5. In a sewing machine, the combination with the frame comprising a hollow standard and a tubular work-supporting arm attached thereto, a shaft extending across said standard and an actuating member mounted on said shaft within the standard, of a feed-bar arranged within and longitudinally of said arm, a rocker connected with said feed-bar and adapted to impart endwise movements thereto, connected with said actuating member, a rock-bar pivotally connected with said rod and with said rocker, a fulcrum for said rock-bar disposed within the standard and having adjusting means exterior thereto, andfeed-bar lifting means connected with a rod operatively said shaft independently of said actuating member.

6. In a sewing machine, the combination with a frame, a shaft and a feed actuating member thereon of a feed-bar extending longitudinally of said shaft, a pivotal support for said feed-bar, a connecting rod embracing and deriving endwise movements from said actuating member, a rock-bar connected respectively with said connecting rod and the feed-bar and provided with a longitudinal T-shaped slot, a slide plate fitted within said slot and carrying a fulcrum stud, a fulcrum block adjustable lengthwise of said rock-bar and provided with a transverse aperture to receive said fulcrum stud, and means for clamping said fulcrum block in adjusted position upon said frame.

7. In a sewing machine, the combination with the frame comprising a hollow standard and a tubular work-supporting arm attached thereto, and a rotary shaft extending across said standard and lengthwise of the work-supporting arm, of a feed-bar arranged within and longitudinally of said arm and disposed lengthwise of said shaft, means disposed within said standard for operatively connecting the feed-bar with said shaft for imparting positive endwise feed and return movements to the feed-bar, means also disposed within the standard and connected with the first-named means for varying the extent of said feeding movements, and means for imparting to the feedbar rising and falling movements.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE E. MOLYNEUX.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

